even if the tempreture does not warm above freezing, the pressure of the snow piled on your car melts the bottom layer, and then it refreezes making it a layer of ice on the bottom. usually it takes vigorous scraping to get this layer off, which is more work than what you would have done if you just cleaned it off with a broom as soon as you could.
it's also good, once you have cleaned up your car, to start it and let it run a little bit, even if you don't plan on leaving your space.
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even if the tempreture does not warm above freezing, the pressure of the snow piled on your car melts the bottom layer, and then it refreezes making it a layer of ice on the bottom. usually it takes vigorous scraping to get this layer off, which is more work than what you would have done if you just cleaned it off with a broom as soon as you could.
it's also good, once you have cleaned up your car, to start it and let it run a little bit, even if you don't plan on leaving your space.